engleski

Perfection of Whiteness and Fluorescence in the Cleanliness and Human Protection

White is clearly preferred colour in many material fields and aesthetic application since it is the most often associated with innocence, perfection, cleanliness, the good and honesty. From physical point of view it is clear that white has the high level of luminosity, no saturation (achromatic one) and no hue. Considering textiles, chemical bleached materials never reach the complete elimination of natural colour and show sligth yellowness. However, when Paul Krais in 1929 discovered fluorescent compound Aesculine by water extraction from wild chestnu, . Nowadays, it is relatively easy to accomplish great whiteness and brightness of white textiles applying the fluorescent compounds, e.g. fluorescent whitening agents (FWA's). Based on electronically-excited molecular state by energy of UV-R (usually 340-370 nm) the FWA molecules show the phenomenon of fluorescence giving to white textiles the high whiteness of outstanding brightness by reemitting the energy at the blue region (typically 420-470 nm) of the spectrum. Recently, the new fluorescent compounds, UV absorbers, were developed for UV- B protection, and even can be applied in washing process to give a new dimension to white textiles.

White, Whiteness, Quenching of fluorescence, Cotton fabric, UV protection

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